G2++ calibration with normal vols

[vegastar314159]

Hi,

I’m trying to use QuantLib 1.6 to calibrate G2++ with european  swaptions in the current market condition where we have negative swap rates.

 I wrote my code like the one for Bermudan Swaptions example and  I provide ATM bp vols. When the calibration starts, it fails as the strikes are negative.

 If fails as it uses the blackformula object where the function checkParameters is called in the function blackFormula. 

QL_REQUIRE(strike + displacement >= 0.0,

                   "strike + displacement (" << strike << " + " << displacement

                                             << ") must be non-negative");

The value of the strike is negative, and the displacement = 0. I saw that we have in the same class, a function named bachelierBlackFormula that does not require any special condition on the strike.

Question : how can I make quantlib call this function instead of blackFormula when creating swaption engines?

 

Many thanks in advance for your answer and suggestions.  

 Kind regards,

MG

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[Luigi Ballabio]

Hello,

    a Bachelier swaption engine will be available in next release. In the meantime, you can check the current master out of GitHub if you want to use it.

Luigi

On Fri, Mar 4, 2016 at 2:20 PM <[hidden email]> wrote:

Hi,

I’m trying to use QuantLib 1.6 to calibrate G2++ with european  swaptions in the current market condition where we have negative swap rates.

 I wrote my code like the one for Bermudan Swaptions example and  I provide ATM bp vols. When the calibration starts, it fails as the strikes are negative.

 If fails as it uses the blackformula object where the function checkParameters is called in the function blackFormula. 

QL_REQUIRE(strike + displacement >= 0.0,

                   "strike + displacement (" << strike << " + " << displacement

                                             << ") must be non-negative");

The value of the strike is negative, and the displacement = 0. I saw that we have in the same class, a function named bachelierBlackFormula that does not require any special condition on the strike.

Question : how can I make quantlib call this function instead of blackFormula when creating swaption engines?

 

Many thanks in advance for your answer and suggestions.  

 Kind regards,

MG

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